Spinodal Decomposition in an Fe-32 at%Cr Alloy during Isothermal Aging
Spinodal Decomposition in an Fe-32 at%Cr Alloy during Isothermal Aging
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DOI：
10.2320/matertrans.m2009029
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发表时间：
2009-07
影响因子：
1.2
通讯作者：
O. SORIANO-VARGAS;E. O. Avila-Davila;V. M. Lopez-Hirata;H. Dorantes-Rosales;J. González-Velázquez
中科院分区：
文献类型：
--
作者：
O. SORIANO-VARGAS;E. O. Avila-Davila;V. M. Lopez-Hirata;H. Dorantes-Rosales;J. González-Velázquez
采用透射电镜、硬度测量和显式有限差分法求解线性Cahn-Hilliard微分偏方程，研究了Fe-32at%Cr合金时效过程中的相分解。数值模拟的结果可以适当地描述该合金等温时效过程中相分解的机制，形态和动力学。相分解的增长动力学观察到在老化的早期阶段是非常缓慢的，它大大增加了老化的进展。分解相的形态包括一个相互连接的不规则形状，没有优先排列的短时效时间和进一步的老化引起的变化，板状的分解富铬相在h110 i方向上的富铁矩阵排列。硬度的增加似乎与时效合金中旋节分解相的相干性和纳米尺寸有关。[doi：10.2320/matertrans.M2009029]
Phase decomposition was studied during aging of an Fe-32 at%Cr alloy by means of TEM, hardness and the numerical solution of the linear Cahn-Hilliard differential partial equation using the explicit finite difference method. Results of the numerical simulation permitted to describe appropriately the mechanism, morphology and kinetics of phase decomposition during the isothermal aging of this alloy. The growth kinetics of phase decomposition was observed to be very slow during the early stages of aging and it increased considerably as the aging progressed. The morphology of decomposed phases consisted of an interconnected irregular shape with no preferential alignment for short aging times and a further aging caused the change to a plate shape of the decomposed Cr-rich phase aligned in the h110i directions of the Fe-rich matrix. The increase in hardness seems to be associated with the coherency and nanometer size of the spinodally-decomposed phases in the aged alloy. [doi:10.2320/matertrans.M2009029]